MIXED CONVECTION HEAT TRANSFER IN POISEUILLE FLOW OF POWER - FLUIDS ACROSS A CYLINDER

Abstract

Newtonian and non-Newtonian fluid flow across circular cylinder has been an important field of study because of its practical applications and theoretical implications in variety of the engineering problems for example in predicting loads on engineering structures such as offshore platform supports, ocean pipelines, risers, high buildings, bridge piers etc. and for analysis of wake control in aeronautical engineering as well (Mohammed and Salman, 2007). Moreover, the effects of the introduction of cylinder in a confined channel is of more vivid importance as nearly all industrial applications of flow across cylinders involve confined flow. Typical examples include the flow, in tubular and pin heat exchangers, in the resin-transfer molding (RTM) process of manufacturing fiber-reinforced composites, in filtration screens and aerosol filters, etc.The knowledge of the hydrodynamic forces experienced by submerged cylindrical objects such as offshore pipelines is essential for the design of such structures. On the other hand because of changing process and climatic conditions, one also needs to determine the rate of heat transfer from such structures. Industrial processes where heat and mass transfer from an isolated cylinder plays an important role include anemometry and chemical or radioactive contamination/purification, glass cooling, plastic and industrial devices and many other processes. Because of the importance of these applications, there has been a great deal of interest in the fluid flow and the heat transfer across a single cylinder from the experimental, analytical and numerical approaches (Bharti et al. 2007; Soares et al. 2005)................